Plug for electrical installation



J1me 24, 1924. v

5. F. WADE PLUG FOR ELECTRICAL INSTALLATION Filed Auz. 27 1920 2 Sheets-She's! 1 z 4 3 a a m fIi/wgwfl W::

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WITNESSES ATTORNEYS I 1 inner end;

Patented June 24, 1924.

UNITED STATES PATENT OFFICE.

BENJAMIN F. WADE, OF PALMETTO, FLORIDA.

PLUG.FOR ELECTRICAL INSTALLATION.

Application filed August 27, 1920. Serial No. 406,827.

To all whom it may concern:

Be it known that I, BnNJAMiN FRANKLIN,

trical connections will be insured by the insorting of the plug. V

A further object of the invention is to provide a plug of the character specified having a handle of such length that the plug may be easily inserted into sockets provided with shades.

In the drawings:

Figure 1 is a longitudinal section through i the plug;

Figure 2 is a side view looking at right an les to Figure 1;

igure 3 is an enlarged longitudinal section of the engaging end of the plug;

Figure 4 is a perspective view of the insulatmg block of another form of plug;

Figure 5 is an end view looking at the outer end of the plug;

Figure 6 is a similar view looking at the Figure -7 is a vertical section through the modified form of plug;

Figure 8 is a horizontal the center of the plug;

Figure '9 is a perspective View of one of the push buttons; 7

Figure 10 is a horizontal section on the line of the push buttons.

In the embodiment of the invention shown in Figures 1 and 2, the plug is shown in connection with a light socket 1 of usual construction, having the internal metallic shell .2 threaded to receive the plug. The plug comprises a block 3 of insulatlng ma terial, as, for instance, porcelain, to which is connected a substantially U-shaped plate, consisti'ng'of a body 4 arranged transversely of one end of the block andarms 5 exten ing on opposite sides of the block in spaced relation. 7

These arms, near their connection with the body, are grooved, as shown, to provide section at about threads for engaging the threaded metallic shell 2 and a handle is connected with the arms 5, the said arms being extended beyond the opposite end of the plug from the body, as shown. This handle consists of similar sections 6 of insulating material, as, for instance, porcelain, and eachhandle section 6 is rigidly connected to the adjacent arm 5.

- At the ends remote from the U-shaped" plate the sections of the handle are loosely connected by a transverse bolt or rivet 7, whose heads are countersunk in recesses -8 in the outer faces of the handle sections. Thus while the handle sections may move toward each other at their outer ends they cannot move away'from each other beyond limits prescribed by the bolt or rivet. As

shown in Figure 1 these handle sections are curved transversely, and the conducting wires 9 from the plug 3 pass between the handle members. p

The body 4 of the plate 45 is held in place m a transverse groove in the block 3, by means of a flange 10 on an externally threaded socket or casing 11 which is held in a recess in the upper end of the block. This socket or casing is threaded into the recess in the block, and the flange 10 engages over an insulating washer 12 which is arranged between the flange and the body 4 of the plate 4-' -5,'and it will be noticed, referring to Figure 3, that the body 4 of the plate has an opening through which the socket or casing 11 extends, so that the sricket is insulated from the body of the p ate.

A conducting bar 13 is connected at its upper end to the-plate 4, the said bar passing through an eccentric opening in the extends upwardly through an axial opening in the plug and is connected with the lower end of the socket by means of a washer 19 which fits into the lower end of the socket.

A headed pin 20 is arranged at the upper end of the socket, the head being within the socket and the pin extending out ofthe socket, and this pin is normally pressed away from the lower end of the socket by means of a coil spring 21 arranged within the socket between the head of the pin and the washer 19. This pin .20 is intended to engage one of the contact members of the socket, to make the electrical connection, the other connection being made throu h the metallic shell 2 and the plate 4-5. he opposite faces of the block 3 near its lower end are recessed, as shown in Figure 1, toreceive coil springs 22 which are arranged between the bottoms of the recesses and the arms 5 of the plate 45 and act normally to press said arms outwardly.

In the operation of this construction, when it is desired to withdraw the plug from the socket, with the arts in the position of Figure 1, the ban is sections 6 are merely pressed together at their free ends.

This movement compresses the springs 22 and permits the handle and plug to be withdrawn from the socket.

Fi res 5 to 10 show the invention without t e handle, being adapted to a plug for ordinary use. With this arrangement, the

lug 23 which corresponds to the plug 3 of Figure 1 has connected therewith a plate 24 corresponding to the late 4-5 of Figure 1.

The arms of the p ate 24 extend only to the lower end of the block 23, that is, to the end remote from the body of the plate 24. Here coil springs 25 are arranged between the said arms and the block, it being noticed from an inspection of Figure 4 that,

B tenants has oppositely arranged radial openings through whic are movable the bodies 29 of push buttons, the heads 30 of thebuttons being outside the collar. The body of each T arms of t e plate 24 will be moved toward each other, to release them from the threads of the socket. The conducting wires 33 are connected with a central contact bar 34, and with an eccentric bar 38 in the same manner as they are connected in Figure'3, the spring arrangement shown in Figure 3 being also used in the present instance.

7 As indicatedin Figure 8, the upper end of the rod 34 is connected with a socket 36 correspondin to the socket 11 of Figure 3, and the coil spring 37 is arranged within the socket, the upper end of the spring hearing against the headed in 38 correspondmg to the pin 20 of Figure 3, while the lower end engages the lower end of the socket.

I claim:

An attachment plu comprising a block of insulating materia 'a substantially U- shaped contact havin a body portion arranged at one end 0 the block and arms extending along the block, a socket carried by the block and having a flange for securing the body portion of the U-shaped contact to the'block, an insulating washer between the flange and the body portion, a spring projected contact pin carried by the socket, an axial conductor rod electrically connected with the socket and contact pin, and an eccentric conductor bar electrically connected with the U-shaped contact.

. BENJNF. WADE. 

